千古

for all eternity / throughout all ages / eternity (used in an elegiac couplet, wreath etc dedicated to the dead)

thousand

see 鞦韆|秋千[qiu1 qian1]

surname Gu

ancient / old / paleo-

a single slip may cause everlasting sorrow (idiom)

sb condemned by history (idiom)

to have eternal regrets (idiom)

to shine through the ages (idiom)

a good reputation to last down the generations